効用

(1)a means of serving; "of no avail"; "there's no help for it"

(2)役に立つ手段

(3)what something is used for; "the function of an auger is to bore holes"; "ballet is beautiful but what use is it?"

(4)何かがそのために使われる

(5)a useful or valuable quality

(6)役に立つ、または価値のある性質